Weather on December 18
San Ramon, CA
55 Years of Data
Avg High
56°F
Avg Low
41°F
Warmest
2013
64°F avg
Coldest
2008
36°F avg
About This Date
December 18th in San Ramon, CA typically brings cool winter weather, with average highs around 56°F and lows near 41°F. Over 53 years of records, the warmest December 18th was in 2013 (64°F average), while the coldest was 2008 (36°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 21% of December 18th dates historically, with the wettest December 18th recording 2.44" of rain. The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
Planning for December 18th in San Ramon, CA? Bring layers as temperatures can vary throughout the day.
Cooling Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 57° | 47° | 52° | — | — |
| 2024 | 58° | 42° | 50° | 0.03" | — |
| 2023 | 58° | 45° | 51° | 1.8" | — |
| 2022 | 52° | 40° | 46° | — | — |
| 2021 | 48° | 36° | 42° | — | — |
| 2020 | 49° | 41° | 45° | 0.03" | — |
| 2019 | 55° | 35° | 45° | 1.22" | — |
| 2018 | 52° | 43° | 47° | — | — |
| 2017 | 58° | 46° | 52° | — | — |
| 2016 | 46° | 32° | 39° | — | — |
| 2015 | 53° | 41° | 47° | — | — |
| 2014 | 50° | 42° | 46° | 0.91" | — |
| 2013warmest | 72° | 56° | 64° | — | — |
| 2012 | 45° | 33° | 39° | 1.52" | — |
| 2011 | 60° | 40° | 50° | — | — |
| 2010 | 49° | 39° | 44° | 2.44" | — |
| 2009 | 60° | 48° | 54° | — | — |
| 2008coldest | 46° | 27° | 36° | — | — |
| 2007 | 47° | 35° | 41° | 1.07" | — |
| 2006 | 59° | 33° | 46° | — | — |
| 2005 | 59° | 48° | 54° | — | — |
| 2004 | 67° | 43° | 55° | — | — |
| 2003 | 61° | 39° | 50° | — | — |
| 2002 | 45° | 32° | 38° | 0.1" | — |
| 2001 | 53° | 30° | 42° | — | — |
| 2000 | 52° | 42° | 47° | — | — |
| 1999 | 60° | 43° | 51° | — | — |
| 1998 | 67° | 45° | 56° | — | — |
| 1997 | 57° | 46° | 52° | — | — |
| 1996 | 51° | 51° | 51° | — | — |
| 1995 | 46° | 43° | 44° | — | — |
| 1994 | 58° | 41° | 49° | — | — |
| 1993 | 48° | 36° | 42° | — | — |
| 1992 | 50° | 30° | 40° | — | — |
| 1991 | 57° | 44° | 51° | — | — |
| 1990 | 53° | 36° | 44° | — | — |
| 1989 | 58° | 39° | 48° | — | — |
| 1988 | 57° | 36° | 46° | — | — |
| 1987 | 54° | 39° | 46° | — | — |
| 1985 | 66° | 44° | 55° | — | — |
| 1983 | 54° | 40° | 47° | — | — |
| 1982 | 55° | 41° | 48° | — | — |
| 1981 | 65° | 50° | 57° | — | — |
| 1980 | 75° | 42° | 59° | — | — |
| 1979 | 72° | 49° | 60° | — | — |
| 1978 | 44° | 36° | 40° | 1.32" | — |
| 1977 | 52° | 35° | 43° | 1.32" | — |
| 1976 | 69° | 49° | 59° | — | — |
| 1975 | 59° | 43° | 51° | — | — |
| 1974 | 59° | 41° | 50° | — | — |
| 1973 | 66° | 47° | 56° | — | — |
| 1972 | 50° | 41° | 46° | — | — |
| 1971 | 58° | 40° | 49° | — | — |
53 years of data from LIVERMORE CALIFORNIA